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<p>In 2023, a leaf blight disease affecting marigold (<i>Tagetes erecta</i>) was discovered in the Inner Mongolia Autonomous Region of China. Samples displaying symptoms resembling <i>Alternaria</i> infection were collected for identification of the causal agent. The collected strains were examined based on morphology and sequence analyses of the internal transcribed spacer region of rDNA (ITS), glyceraldehyde-3-phosphate dehydrogenase (<i>GAPDH</i>), the plasma membrane <i>ATPase</i> (<i>ATPase</i>), translation elongation factor 1-alpha (<i>TEF1-α</i>), and RNA polymerase II subunit (<i>RPB2</i>) genes. Both analyses reveal that the strains belong to <i>Alternaria</i> species in the section <i>Infectoriae</i>, representing a novel species designated as <i>Alternaria tagetis-erectae</i>. The new species is phylogenetically closely related to <i>Alternaria cannabina</i>, <i>A. montsantina</i>, <i>A. pseudoventricosa</i>, and <i>A. ventricosa</i>, but is distinguishable based on conidiophores, conidia, and beak formation. Pathogenicity tests confirmed its pathogenic nature.</p>

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A new Alternaria (Pleosporales, Pleosporaceae) species in section Infectoriae associated with marigold (Tagetes erecta) from Northern China

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Sein Lai Lai Aung,
  • Ya-Nan Gou,
  • Qian Deng,
  • Jia-Hui Huang,
  • Jian-Xin Deng,
  • Yi Zhou

摘要

In 2023, a leaf blight disease affecting marigold (Tagetes erecta) was discovered in the Inner Mongolia Autonomous Region of China. Samples displaying symptoms resembling Alternaria infection were collected for identification of the causal agent. The collected strains were examined based on morphology and sequence analyses of the internal transcribed spacer region of rDNA (ITS), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), the plasma membrane ATPase (ATPase), translation elongation factor 1-alpha (TEF1-α), and RNA polymerase II subunit (RPB2) genes. Both analyses reveal that the strains belong to Alternaria species in the section Infectoriae, representing a novel species designated as Alternaria tagetis-erectae. The new species is phylogenetically closely related to Alternaria cannabina, A. montsantina, A. pseudoventricosa, and A. ventricosa, but is distinguishable based on conidiophores, conidia, and beak formation. Pathogenicity tests confirmed its pathogenic nature.